<!DOCTYPE html>
<html>

<head>

    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">       
    <title><%= title %></title>
  
    <link rel="stylesheet" type="text/css" href="/stylesheets/bootstrap.min.css" />
    <link rel="stylesheet" type="text/css" href="/stylesheets/signin.css" />

</head>

<body>

	<div id="container" class="container">
       <% if (locals.success) { %> 
          <div id="alt_sucess" class="alert alert-success"> 
            <%- success %> 
          </div> 
       <% } %> 

      <% if (locals.error) { %> 
        <div id="alt_warning" class="alert alert-warning"> 
          <%= error %> 
        </div> 
      <% } %> 

      <form class="form-signin" role="form" method="post" enctype="multipart/form-data">
        <h2 class="form-signin-heading">上传头像</h2>
        <div class="form-group">
            <input id="fileupload" type="file" name="fileupload" />
            <p class="help-block">选择你的头像</p>
          </div>
        <button id="btnSub" class="btn btn-lg btn-primary" type="submit">提 交</button>

      </form>  
      
    </div> 

</body>

</html>

<script src="/javascripts/jquery-1.11.0.min.js" type="text/javascript"></script>

<script type="text/javascript">
     String.prototype.format = function (args) {
            var result = this;
            if (arguments.length > 0) {
                if (arguments.length == 1 && typeof (args) == "object") {
                    for (var key in args) {
                        if (args[key] != undefined) {
                            var reg = new RegExp("({" + key + "})", "g");
                            result = result.replace(reg, args[key]);
                        }
                    }
                }
                else {
                    for (var i = 0; i < arguments.length; i++) {
                        if (arguments[i] != undefined) {
                            var reg = new RegExp("({)" + i + "(})", "g");
                            result = result.replace(reg, arguments[i]);
                        }
                    }
                }
            }
            return result;
    }

    $(function(){
        $('#btnSub').on('click',function(){
            var
            errorTip = '<div id="errorTip" class="alert alert-warning">{0}</div> ';
            fileuploadVal = $("#fileupload").val();

            $("#errorTip,#alt_sucess,#alt_warning").remove();
            
            if(fileuploadVal.length == 0){
                $("#container").prepend(errorTip.format('请选择要上传的文件'));                                
                return false;
            }
            
            var extName = fileuploadVal.substring(fileuploadVal.lastIndexOf('.'),fileuploadVal.length).toLowerCase();

            if(extName != '.png' && extName != '.jpg'){
               $("#container").prepend(errorTip.format('只支持png和jpg格式图片'));                             
               return false;                
            }

            return true;
        })
    });

</script>
